newbie's question on file permission

[Zhengguo Xu]

many thanks!  all of you. how can I change the permission for whole disk?

2008/8/1 Zhengguo Xu <tworiversfolk at gmail.com>

> Thanks a lot, Zack!! it indeed is FAT32 disk. I do need to connect this
> disk to windows from time to time, but I had the impression that NTFs is not
> best support by Linx. or am I completely wrong about it? writing to NTFs
> disk in linux is now perfectly normal?
>
>
> 2008/8/1 POWERS, ZACK <zpowers at umflint.edu>
>
>> Hi,
>> The reason permissions don't change on your USB stick is because your
>> USB disk is formatted in a filesystem that does not support POSIX
>> style file permissions. If its FAT16 or FAT32, which it is most likely
>> is, it doesn't support any type of file permissions. To solve this
>> issues you will have to reformat your USB disk to a POSIX compliant
>> filesystem (NTFS would be the best choice for compatibility with
>> Windows).
>>
>>
>> -----Original Message-----
>> From: ubuntu-users-bounces at lists.ubuntu.com on behalf of Zhengguo Xu
>> Sent: Fri 8/1/2008 2:37 PM
>> To: Ubuntu User
>> Subject: newbie's question on file permission
>>
>> Greeting all!
>>
>> Recently I encounted a strange problem (or it maybe very obvious for
>> you
>> guys) while copying files and I'd like to ask a question on file
>> permission
>> in linux.
>>
>> I have a file, lets say 'biology.ppt' and it has permission as follows
>> and i
>> am the owner and it belongs to group 'root'
>>
>> -rwx------
>>
>> i want to change it to group, say, 'test', and give permissions to
>> everyone
>> to read and write and execute, what's wrong when I run the following
>> command?
>>
>> sudo chgrp test biology.ppt
>> sudo chmod 777 biology.ppt
>>
>> nothing happened when i run these commands and i tried them with and
>> without
>> sudo. the file still has the permission -rwx------ and root is still
>> the
>> group.
>>
>> if it matters, the file is on a usb disk mounted in /media
>>
>> i also tried to create some file in my home directory and i can change
>> it as
>> i want with the same command.
>>
>> any help would be greatly appreciated.
>>
>>
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>>
>
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